[PATCH] [OPENMP] Fixed codegen for 'reduction' clause

[Alexey Bataev]

Hi rjmccall, hfinkel,

Fixed codegen for reduction operations min, max, && and ||. Codegen for them is quite similar and I was confused by this similarity.
Also added a call to kmpc_end_reduce() in atomic part of reduction codegen (call to kmpc_end_reduce_nowait() is not required).

http://reviews.llvm.org/D9513

Files:
  lib/CodeGen/CGOpenMPRuntime.cpp
  lib/Sema/SemaOpenMP.cpp
  test/OpenMP/for_reduction_codegen.cpp
  test/OpenMP/parallel_reduction_codegen.cpp
  test/OpenMP/sections_reduction_codegen.cpp

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